The nackCount property of the RTCRtpStreamStats dictionary is a numeric value indicating the number of times the receiver sent a NACK packet to the sender. A NACK (Negative ACKnowledgement, also called "Generic NACK") packet tells the sender that one or more of the RTP packets it sent were lost in transport.
Syntax
var nackCount = RTCRtpStreamStats.nackCount;
Value
An integer value indicating how many times the receiver sent a NACK packet to the sender after detecting that one or more packets were lost during transport.
Note: This value is only available on the receiver.
Specifications
| Specification | Status | Comment |
|---|---|---|
| Identifiers for WebRTC's Statistics API The definition of 'RTCInboundRtpStreamStats: nackCount' in that specification. |
Candidate Recommendation | Initial definition. |
| Identifiers for WebRTC's Statistics API The definition of 'RTCOutboundRtpStreamStats: nackCount' in that specification. |
Candidate Recommendation | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
nackCount | Chrome No support No | Edge No support No | Firefox Full support 55 | IE No support No | Opera No support No | Safari ? | WebView Android No support No | Chrome Android No support No | Firefox Android Full support 55 | Opera Android No support No | Safari iOS ? | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown